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Nine feared dead in US air crash
The helicopter went down on Tuesday night about 35 miles (56km) north-west of Redding in a remote area.
The cause of the crash of the Sikorsky S-61 was not immediately known.
The helicopter was carrying 11 firefighters and two crewmen. Four people are being treated in hospital for burns.
Two are said to be in critical condition and two serious.
Ian Gregor, spokesman for the Federal Aviation Administration, said the helicopter was destroyed in the crash.
The firefighters had been tackling a blaze that was covering 27 sq miles (70sq km) of the Shasta-Trinity National Forest.
Investigators are being sent to the scene.
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